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arXiv · 2406.18196

Broadband Spontaneous Parametric Downconversion in Reconfigurable Poled Linearly-Uncoupled Resonators

Alessia Stefano·Luca Zatti·Marco Liscidini
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Abstract

In this letter, we study spontaneous parametric down-conversion (SPDC) in a periodically poled structure composed of two linearly uncoupled resonators that are nonlinearly coupled via a Mach-Zehnder interferometer. The device does not require dispersion engineering to achieve efficient doubly-resonant SPDC and, unlike the case of a single resonator, one can reconfigure the system to generate photon pairs over a bandwidth of hundreds of nm. We consider the case of SPDC pumped at 775 nm in a periodically poled lithium-niobate (PPLN) device compatible with up-to-date technological platforms. We demonstrate pair generation rates of up to 250 MHz/mW pump power for a single resonance and integrated pair generation rates of up to 100 THz/mW pump power over 170 nm. When properly reconfigured, a single device can efficiently generate over a bandwidth of some 300 nm, covering the S, C, L, and U infrared bands.

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Alessia Stefano, Luca Zatti, Marco Liscidini. 2024-06-26. Broadband Spontaneous Parametric Downconversion in Reconfigurable Poled Linearly-Uncoupled Resonators. https://arxiv.org/abs/2406.18196

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